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    <title>Document</title>
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<body>
    <h1>这是一个登录页面--500行代码</h1>
    <form action="">
        <div>用户名 <input type="text" name="" id=""></div>
        <div>密码 <input type="password" name="" id=""></div>
        <button>提交</button>
    </form>

</body>
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